Akdaman1,
I would suggest you use a 2nd memory card and keep a back up file on there. I dont think you can keep two files from the same game on the same memory card. Problem is you cant copy save files from certain games like F-Zero GX. My suggestion for that would be to start the game, take out the first memory card and put the new memory card in and try to save. It will say a save file doesnt exist and ask if you want to make one. Not sure if it will work with the copy protected save files (F-Zero etc.) but you can try.
TOY